palingenesis
noun
pal·in·gen·e·sis ˌpa-lən-ˈje-nə-səs 
: metempsychosis
palingenetic
ˌpa-lən-jə-ˈne-tik
adjective 
Word History
Etymology
New Latin, from Greek palin again + Latin genesis genesis
First Known Use
1661, in the meaning defined above
Medical Definition
palingenesis
noun
pal·in·gen·e·sis ˌpal-ən-ˈjen-ə-səs
plural palingeneses -ˌsēz
: the appearance in an individual during its development of characters or structures that have been maintained essentially unchanged throughout the evolutionary history of the group to which it belongs